title: The impact of the non-linearity of the radiant flux on the thermal load of the color conversion elements in phosphor converted LEDs under different current driving schemes.
abstract: For a systematic approach to improve the reliability and the white light quality of phosphor converted light-emitting diodes (LEDs) it is imperative to gain a better understanding of the individual parameters that affect color temperature constancy and maintenance. By means of a combined optical and thermal simulation procedure, in this contribution we give a comprehensive discussion on the impact of different current driving schemes on the thermal load of the color conversion elements (CCEs) of phosphor converted LEDs. We show that on the one hand a decreasing duty cycle under pulse width modulation driving conditions may cause a notable temperature variation and on the other hand also effects due to the non-linearity between the blue radiant flux and the current have to be considered for the thermal load of the CCEs.
authors.forename: Franz P
authors.initials: FP
authors.lastname: Wenzl
authors.forename: Christian
authors.initials: C
authors.lastname: Sommer
authors.forename: Paul
authors.initials: P
authors.lastname: Hartmann
authors.forename: Peter
authors.initials: P
authors.lastname: Pachler
authors.forename: Hans
authors.initials: H
authors.lastname: Hoschopf
authors.forename: Gregor
authors.initials: G
authors.lastname: Langer
authors.forename: Paul
authors.initials: P
authors.lastname: Fulmek
authors.forename: Johann
authors.initials: J
authors.lastname: Nicolics